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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4557197eb495841a23752a7d2f7df6b5f0a85658531d0a367ecba2871c5cae5f' 
  AND token = 'MJK1clG3JqLj7kcQNC55Q7lo+8apw95HxjtBezmYmVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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