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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4069fc846caa4bca5f6a4db8d3ac18b77739aa67983a66cf54037645033d5f6a' 
  AND token = '/3n5LuExLn5mqOL0f/XcawknkKhvqUioGt+BnscCmgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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