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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e282cc72b9f309053eb8cfcbc5a1f286400b10a7b21fc42ad5b2156c723df2ae' 
  AND token = 'M4UBLvTylxy8wMad/X93PukP7GC08GBVN3mTnapJlyU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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