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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91488632afedc5109ea3c34a2679845516fd69f8b517c02701b615a231526fcc' 
  AND token = 'GWSpU353M0UT8oKsseqfTE2CzS1XM7wmTPhqhpS7tg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00080

JSON explain

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