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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5146c6035b56794f8f1db0bc23cf9aed61f32508ca0a1cb94be60fd50be642c2' 
  AND token = 'iHZSjL8ePyJAORP6woI651ej2R6dqmQp1tajXpYMuk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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