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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd96d07a0148072b6e32e9f1753804ee19044f63225830c444ef7ac5f1096f40d' 
  AND token = 'ZASub1neZKogt+FBFZyRZBYpXDGMr6gw+SKc88mKfHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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