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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '90e6f5ca83d470237fc89ed049d1bc17888e84508bb8f60f182243d7c760b499' 
  AND token = 'OfDMsYKPVrnabGxGSFx4DUevVIKak3V2sNfXP1FNgmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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