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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df76af50be98cf6ce63790f855d47f7ac4e7184d319075d1f6d919516cc43635' 
  AND token = '8ychCFa1fthnVcPHR6jkU0y1psgchTsJNQ7m1cSS+5A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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