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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc9acd5e1d4933468346b696ff1cd1720917e9ad6a0ae21008caec376afadd1b' 
  AND token = 'KMlcXp3oKvSYfwQsW4mK1bdbMc2+SN53VWYQ4Sw7bYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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