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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34f5d1689907a1d6c6e8598a35b2ebc3551ed6fc95ed8e7cd8f9f18b116883c9' 
  AND token = 'b4S14m+C4CWVgvCfTGzBod9QhrVy4XQrf/DbODMbgQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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