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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e42bc3b037eb5ef7f593893da426a4cadf7434e97a2c7a147723186218ad62ef' 
  AND token = 'H8Pr2Lftd2vuavg6W/5TBNxj0F9YRSJrIkeSf23Lrzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00074

JSON explain

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