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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23dab55f924f6b2d3f6ed4926d07ac817b4d83ca9d1c5e3918573a67bb2add41' 
  AND token = '5wVnRH4DblcPKKOEZSHGjWe6njIPUF9xE/3KxKo7daY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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