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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86c3ee0d871bdd201f0d0e5f310ba4ab1c9549442f176ebaf4cf5330c40be800' 
  AND token = 'dMWIlOPvXTx2vNGpM/nfJb6IdvfOCdH9TSF0LOqxMN0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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