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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f2e930d6348298d58e6d5c2372c49e206d7057620beefe6b015826cd6dded5f' 
  AND token = 'yjGVS4i0tUonK0IGkkDHW81yOIhoJZEj5petUq8+yEY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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