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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87fd6f7ad8cf141d0fcb59f4060425368726f00c7bb2a2ea206264d9eab4f801' 
  AND token = 'vKSJaM7aSKUuD6HbpKpm4mYaoJPQkyZvxx5v/bW9Zg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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