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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c70e0661366ebdea0974b7e6697d825a744175ef2ee7c9da7d96a800fed38dd9' 
  AND token = 'cTDozOpA80TLW3lVKLCFg1Ki/DzvQZ9Sax314MKOUy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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