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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8fc51a61eec8bbc476800a48e9aeac8337f3f65f2b5fe8c5a0ec87ca9e76f22' 
  AND token = 'ChhqJiy8inzmz2NtnX1Rm67/W7sDKrVUDhvTpuIJ5Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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