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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5698a1791cd477e7586d987e747e0c435f5bc8faf7371c238fb7d4bdef8b4fe7' 
  AND token = '2uoLaMHhmZi9U8tzQPRHXEPLiRC4UknTpRJuFLblKCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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