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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2e8c4f4754a045bab385231dd435434888ea22626e815beb30d25eb664971a7' 
  AND token = 'FqiKk82nrAshwRA0ldOv3GIGbae5JGa03qbPkw9sFD0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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