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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae71c2be2762a009f5b38f469c4e1a2b3e0dd5cfb532358fb04a3aa66af58cbe' 
  AND token = 'Hurket16m+4AuxzEuD5TueWd6arg1aY/6pb9/rhABXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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