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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e795a58e50f4bab844251d4563f66b2163e7412d8a0bf448780ead8e836c594' 
  AND token = '/IEh0VghsP+PDb8+bgAJXyHMWEr+qLHqG5G/I8NaKSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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