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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cf33d257de7756d69f7233b28cc6bcf55ea8a88a66171f2a58836c2cd53a315' 
  AND token = 'rsY8p2bVWFFETl4UgpN/uA4d4UFzynD3wmbD9lGzWwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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