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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86eb449c008d122db456b8973e79d9e1b116cf77d1a940f096be90c1dd2fd527' 
  AND token = 'KocKfEAtFfNfj8E4sJaHHyNF6pptCJc7fbX60eGuvYs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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