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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f589c8b2272c531d3a9a12df4f4983773e62ab1d72c65b9a5a36ebd8c5af53d3' 
  AND token = 'dDUCvfgu6y7xYEhwUCsmRLuXheyyrSiQpf5eihcaRKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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