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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f7969243537af8c169d34215de53231bf192e7f87c5b8181638f6fb33e9456a' 
  AND token = 'd276/oGXC4EfFsYLteAJex4PZh/mM+Stmsi/R6bVIMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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