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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94727d92aa4bd28382bd2d36b6fa74b3bdd6de4315dd8845be16298bc21c0ddc' 
  AND token = 'oDH1c9RXyJ7aVifn+Doh55ZVCX/49P41Nn6asQEcIFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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