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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdcbaff9d308dae6b76051e5c307ecc4ea0064756be3ac020936a66f4a45aa00' 
  AND token = 'zzfgtbNgyY37o7s8Kq81mpx52WO37L5MLK2isCuPIec=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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