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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e0c522790337981b2aa75322a6bd9ae4990e4e5d25b0461c5a7658942332e9b' 
  AND token = 'CFu87vFsxcv6by3kgZtNfPWJqxUIYyQF+pt0jklvKvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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