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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89c7729ff7501d8b6068648ee38d9e4a75929c0b37cc37e1e087ec8435c5c4aa' 
  AND token = '9mJtacfYZ3YzhFys7mDBMZSKZxWrW2c3fEPZxbce7+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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