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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c1f2cdb6a4d7c69c94c8c748b64206e68c70caa94036ee31b0e6c1a6c627614' 
  AND token = 'cC/b+ajpi6nTDLIZD8YlbEIVh/ttx9nepSzSUdIT4wY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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