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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cba477ef502ce91f70b9d2bf7612e77c7aa52d10c4de4924d74570a55927e07' 
  AND token = 'wDT6AOqkUsExdr7XVBCy5FUT46jlS3sgzUAgVtsJ+fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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