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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1cabf9fa84a1fd4df22fdc127638da9e70362466632e2efdf6b625792bc2cbe' 
  AND token = '6D8DWqq+o6+gIVRVhtNFCNLuvN6dpVzMF8N7ARbsJoQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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