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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4df97a50f354a7d1b28305ad1f9841ef62d43f1e9e5d4cf1c6cf81ea4879b4c' 
  AND token = 'B73hWGn0nC305kAa+DswxHbs+MdvxDrk3lHv4+8bZrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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