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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b627ef5cd746d4672862c3bf4ac1fd1819594c698ce197a6143a276b41fa9e9c' 
  AND token = '+n8IPfPsOeQfTKwId+W4QUVa6sPUEq5ibnFE7+1AiJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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