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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8c0eedb0a3c5d3a38c01dc8cb96d7b689ab418b862cdb95f25278bb79f230fa' 
  AND token = 'osjNeh0YKo1e977y08dzyCO59mPI8pNasCk/VcsbIpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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