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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b02d5c6d418c0bfd5467758f4d0e36eae3966787729e9809b0fa2ea9c1b89057' 
  AND token = 'HLgdV1NRoAlrQiUyruwfQgmiex8a2uoYWa/GoVA0jOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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