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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c912354e16bf78c3dabbdae39093176bb8afd3c04213b00ea526dc32260e651a' 
  AND token = 'XEec3RaU3mRcU5lV+0WBU7rfRXN8dqGVpS30DJ060W8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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