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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59fad2f4f289a3312436986bd7e87cd6c0e33ab0fe357a2f0600b990f7892623' 
  AND token = '3af5l/D3Cm+Po837BbzPE3NGh2Q+wc2GvKh7NaEEqDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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