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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a210427f58211727762f4af50cede3a428d05dd42ef7357eb04996fafde8bafd' 
  AND token = 'Jwa2UXeFmSC+kqsEiq4KJwArV4l5ca4jq99zHI85Qrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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