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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef83f25226784651a2a3057d74349b062cb2e311f94e3f70104948b59d6171d2' 
  AND token = 'dc9ujVCx1KQWrHS0hK1OVqY8a4upEwyPWQnd4t4JX3M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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