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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431cfaecf7b3ed39258ae6ab5af7e9419c30507c2404fef0c99f755fb76998ea' 
  AND token = 'C+CkyZ+9f/9Ou4om4TxhkB9QBJyGcvxIOxkFB/ByD6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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