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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72035fbd1e10396d9cfd1f4a7a1ceb57716e933274dd75adfb73fb261559095b' 
  AND token = 'yS4f8VNF53f0u8ZerfEyPmvAFd0hakgxN+SrY0fN+K4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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