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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13cf12cdbb2add0afec4b51ed29c7fcd27c7bd38584de5d65fc241ac9b780c07' 
  AND token = 'ohJkdQr2IEexiG+DE8LeSszyfh2fwuC7yq6jNV9nu3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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