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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65470535a3f95cf57b8f1ae63b65892848c505f0868d863e32ad1bc2b31f3259' 
  AND token = 'Th5NNGQr1X0OESX6VTXObFxFSOnb4X7x1IiaD1bq95s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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