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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b8c149a4e7b90764fb07e79b1899e677e99b712ced126cf9de63c9ffc0b8489' 
  AND token = '9FuL9ugnlhKCG2R3QwfmWhYvjYjQ9sSNpQYpysK8hds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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