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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64422f7770467a35ea7870da628df6dc73c62b176fb4848f2bc79b985f604c3b' 
  AND token = '66xe+nnG1Pl/FQEae88BtH/V7aLvpJvTljbB/CqW4so=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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