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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a3c16c4e95b7fb4faf061bb7c1e72f74e65c8835fc9e971e7e4d28734ca8392' 
  AND token = 'Tz6PTKaqZSTIrrG88xLm9d3c7ef2Lj87XN6xKAgcu1I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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