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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6aed25ba035a8f7c7b62ec125324a7c47fea352b3ffc561a4c791cec7383720' 
  AND token = '8bIddH2uoQ2ja40kgWYWEeVeJ/EWt6Tj9UXDTvRWK9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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