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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3cd14910ac34c17e9d08519459f2df4cf2c7d6e68d1e45e02a5ca42e60340a8' 
  AND token = 'Pj5BuiCGLBunETywCHHnyjLloSLmFZlaGf7U4t3fWhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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