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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8d3633481d52fba01cbe506dd5fadfb3480e768a808800e3cbce58afab4b67c' 
  AND token = '3kfX2o2mc+q5uvuTjiMao9Ue0EcOd6811KBgarnxJBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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