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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '070ec478ecde5348478878c35526ef645ae2e4dbff0a3cf483c05fff66e509b3' 
  AND token = 'OeDqLVc3kMnp2U40XkkCmG+e10+p59E8hSS8FyNIcu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}