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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c67639d9edc619d3f5540eb3d8192fe201491838c4c2b5570e755ae172f1d558' 
  AND token = 'u01jEhgiXl0wwlkiOJ3WXPrAiCQIjhYpWK4j8xblFO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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