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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d1c2cd8a869b85d7ae772b5f27b7dacffcfe9506668803b50cdae52ca0bccbd' 
  AND token = 'LCspGrtCCKc5TAmNlitsy3HnC5lRz8RF9XUz0zO0mnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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