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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2cff4cbcaca2f5bd8ea83208ec00d08301d83b26e3c3a6a2f46983f942903e76' 
  AND token = 'aNmD3LtvLvckWCTJUhgqrcwE8iF/ksX+zJsSvAucwTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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