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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff214770b835bbb9b88058ee9240df913d6e2e8735ab913a6de260698495cfb' 
  AND token = 'gZg5t4TpoyKaaA/Hl40N3EF/uxDoZpZyc23zfWzTbQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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